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Basis of Presentation and Summary of Significant Accounting Policies (Detail) - USD ($) shares in Thousands, $ in Millions |  |  | 3 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 07, 2018 | Dec. 30, 2016 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Net loss incurred |  |  |  |  |  | $ (81.2) | $ (89.3) | $ 67.2 |
Gain (loss) on disposition of discontinued operations, net of tax |  |  |  |  |  | 3.0 | 5.3 | (81.3) |
Business acquisition and other investments, net of cash acquired |  |  |  |  |  | 180.8 | 0.0 | $ 0.0 |
Retirement of treasury stock (in shares) |  |  |  |  |  |  |  | 0 |
Amount of retirement of treasury stock |  |  |  |  |  |  |  | $ 0.0 |
Foreign Currency Translation and Transactions |  |  |  |  |  |  |  |  |
Foreign currency transaction net losses |  |  |  |  |  | $ 0.3 | $ 3.3 | $ 2.4 |
Common Stock In Treasury |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Retirement of treasury stock (in shares) |  |  |  |  |  |  |  | (50,000) |
Amount of retirement of treasury stock |  |  |  |  |  |  |  | $ (2,948.1) |
Paid-In Capital |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Amount of retirement of treasury stock |  |  |  |  |  |  |  | 1,285.4 |
Retained Earnings (Deficit) |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Amount of retirement of treasury stock |  |  |  |  |  |  |  | $ 1,662.2 |
Balcke Durr | Engineered Solutions reportable segment |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Net loss incurred |  |  |  |  |  |  |  |  | $ 39.6
Balcke Durr |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Gain (loss) on disposition of discontinued operations, net of tax |  |  | $ 3.8 |  |  |  |  |  |
Balcke Durr | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Gain (loss) on disposition of discontinued operations, net of tax |  |  | 3.8 |  |  |  |  |  |
SPX Heat Transfer Business | Disposal Group, Not Discontinued Operations |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Wind-down charges recorded |  |  | 3.5 |  |  |  |  |  |
Proceeds from sale of intangible assets |  |  | 4.8 |  |  |  |  |  |
Gain on sale of intangible assets |  |  | 0.1 |  |  |  |  |  |
Subsidiary of mutares AG (the Buyer) | Balcke Durr | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Gain (loss) on disposition of discontinued operations, net of tax |  | $ (78.6) |  |  |  |  |  |  |
Cost of Sales | SPX Heat Transfer Business | Disposal Group, Not Discontinued Operations |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Wind-down charges related to inventories |  |  | 0.9 |  |  |  |  |  |
Special Charges, Net | SPX Heat Transfer Business | Disposal Group, Not Discontinued Operations |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Wind-down charges related to impairment of machinery and equipment |  |  | 0.6 |  |  |  |  |  |
Wind-down charges related to severance costs |  |  | 2.0 |  |  |  |  |  |
Schonstedt Instrument Company |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Business acquisition and other investments, net of cash acquired |  |  |  | $ 16.4 |  |  |  |  |
Cash acquired |  |  |  | $ 0.3 |  |  |  |  |
Cues, Inc. |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Net loss incurred |  |  |  |  | $ 0.4 |  |  |  |
Business acquisition and other investments, net of cash acquired | $ 164.4 |  | 164.4 |  |  |  |  |  |
Cash acquired | $ 20.6 |  | $ 20.6 |  |  |  |  |  |

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